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Finding the Fourth Proportional to 780.34, 1,169.70 and 317.92

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Solution

The fourth proportional to 780.34, 1,169.70 and 317.92 is: 476.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.34 : 1,169.70 = 317.92 : x
  2. Step 2: Convert to fraction form
    780.34/1,169.70 = 317.92/x
  3. Step 3: Cross multiply
    780.34x = 1,169.70 × 317.92
  4. Step 4: Simplify right side
    780.34x = 371,871.02
  5. Step 5: Solve for x
    x = 371,871.02/780.34
  6. Step 6: Final answer
    x = 476.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.